Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a978ae58f3352e…

MALICIOUS

PDF

75.4 KB Created: 2020-12-14 21:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3b9251fd9312f853e172dd3353c9c9a5 SHA-1: 1f8a4b55bba6c68b8aeea249f722c6f52467105c SHA-256: e6a978ae58f3352e05058771ce899a0d1b1b325d67ca82d0bde235acb3c31714
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large link farm. The ML classifier also strongly flagged this PDF. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document is designed to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffmen.ru/123?utm_term=cygwin+ssh+sftp-server In PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/dukowunobazogavov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fc296d13e487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fa4491a02688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5fc7c6fe276ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5fbf5220ad2bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc79767160b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/statistical_quality_control_7th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/91225141164.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4eeaca5bc066edfbf657c/t/5fd1b9afeeaf2774ac8c2bd4/1607580080095/kaniwuturasiwibep.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/20382847555.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/kofimikovuxugatonoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/dawifapujutelul.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15a3c60f2895dc1eafeb7/t/5fc7a9433d56556d14453df3/1606920516001/nenosada.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/pexejefogolimigar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 6124 bytes
SHA-256: ad4724190b15962adbbc8a1687c2c8d9b5643f0ee4373fd2abb856542d4468e4
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 5112 bytes
SHA-256: d048ff8a940d730c0f05599fe1bd385fb4fdcff1c6a00fc0cf0c42f24b2acabe
font_02_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 14296 bytes
SHA-256: 5c43650e37ab0cc25798d241ccb14f3d39a29c5d381d65b4815603bed0a4f9b5

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